My first onset of T was mild and back then it was quite alright to go to movies, even loud ones (like action movies or so). Never noticed any effect.
However, these days my T is very reactive and I don't think I have the courage go to movies anymore. I used to go regularly and after getting worse reactive T in September, I thought wearing earplugs would protect me and went to the movies for four times. Doctor Strange, A Monster Calls and Fantastic Beasts were all okay - it seemed like my earplugs were protecting me enough. Then in December I went to see Star Wars in the same theatre with those same 30 dB earplugs. This time I could feel it was very loud with all the explosions and stuff. I even took my phone out to measure decibels to decide whether to leave, but it only showed ~80 dB - maybe it isn't even capable of recording those vibrating bass frequencies? Or then my T is just really sensitive. Anyway, it caused a massive spike in my T. Before that my T had stabilized and been gradually getting better, but the movie just sent it back to its worst. Not sure if my T would have remained in the calmer state without that movie, but I didn't have any milder days for weeks - maybe even for a month. So not worth it and I don't think I'll be going to the movies anytime soon.
It is a pity, since it was a very dear hobby of mine and really enjoy the escapism movies provide. Oh well, TV will have to do, for now.