Ellen,
my male instructor actually is Russian and I have returned from lessons with the odd bruise :) I don't mind the harsh lessons with him because he manages to be critical but still keep an overal friendly relationship (and he checks with students that they are up for the harsh ride).
And I have experience with harsh trainers in martial arts and professors at university. The very fierce and critical approach works well for me... if I see results and that it is the instructors way of teaching.
With my female instructor we had a perfect relationship at first. Up to the quick peck on the cheek as a greeting if she hadnt seen me for a longer period of time (read 3 days).
If I was around the studio she'd call on me so she could show newer students what the figures they were working on should look like. Help her out in group lessons when she didn't have enough men.
And at some point it went downhill.
I tried talking to her to find out what happened and if I did something to offend her, but the reply was "My behaviour is normal, I am as I always am with everyone. You are different but I have to accept that." *turn away, walk off keep back turned throughout the group lession that followed and actually walking away when my partner and I were to show the step* normal behaviour huh yeah right...
The studio is owned by a lady and her daughter. The daughter is same age as my instructor and I (and we just found out that she and I had pretty much parallel lives where we always nearly met since we were 11 and only by coincidence didnt. We even sat the same exams in the same room at one point) so I talked to her yesterday (for about an hour). She said a change of instructor would of course be necessary. She had noticed herself during the last practice party that something seemed wrong and had wanted to ask. And of course I am right and the behaviour is way off and she will talk to my instructor. She was genuinely fascinated because in the three years my instructor teaches there, there has never been any behaviour remotely like it and now suddenly with a guy who will apologise for being 1 minute late.
And at some point she just started laughing because the image she gets when she hears about our fighting/arguing etc is that of a married old couple.
Her first explanation was that she thinks my instructor is trying to make sure people realise that we aren't actually a couple off the dancefloor and in order to do that has, out of a certain amound of insecurity, projected a lot of hostility my way. (there are some lady students at the studio who believe we'd make a perfect couple - I am not going to put up a pic)
Well in the end she was really cheerful ("Oh when you said you had trouble I thought it would be much worse")
and finished with a big grin "I have to talk to her. I think I know whats going on. I really do think I know whats going on. Oh I do have to talk to her."
...well I told her that I'd try to finish working on our tango choreography but I'd quit the studio afterwards regardles of what comes out of her talk with my instructor. Even if it means loosing other instructors that I had a perfect relationship with.
I have started shopping around and have so far found quite a few studios that aren't up to standard.
The first one I visited a studio party and the male students would do something like the cross body lead to triple fan (step 17 on this site's smooth tango syllabus) but couldn't do a Tango close at all (they would stop, turn to face the lady and try and pick up the beat again). No couple could follow the LoD doing foxtrot basic steps (the one that did followed it in the wrong direction)... they seemed to teach flashy moves but nothing else at all.
The second studio has an instructor they poached from my old studio... thing is he never finished his training as an instructor. He is a great dancer but it doesnt really recomend the studio. Especially as they are now trying to poach the next student doing full bronze who I know isnt up for teaching yet.
So I have crossed 5 or 6 independend studios off my list and will have to look at the big chain studio...
I hope I find a place. Dancesports are still in a very early state in Greece so I am not really spoiled for choice.
P.S.
forgot: about learning speed... I did the introductory program a lot faster than most of the other students and learned steps very rapidly (it does help practicing at home before going to bed of course

) but now when it comes to technique and especially hip movement for latin dances I have come to a complete standstill. But technique takes time. Even the ballroom dances which is where my strength lies, body memory isnt going to come within a couple of months. I have been dancing for a mere 6 months now and though at 27 I am young compared to others I spend the last 10 years bend over drawings be it trying to get into uni, trying to get out of uni or sometimes even working (I'm an architect... finally).