I agree wholeheartedly! It's even worse when someone makes a comment about a manga that says something along the lines of "I loved this manga! Seme-kun was so hot and his uke was just perfect for him♡" I mean it's bad enough that they're stereotyped into "top" and "bottom" but now that's there names even? Seme-kun and Uke-chan? If you loved it so much you should at least look back and re-read their name's if you can't remember them XD There's a limited amount of manga where they switch roles willingly unfortunately.
I hate the way the vast majority of yaoi mangas portray the concepts of seme and uke as set in stone. Most managakas also seem to go out of their way to make the uke weaker, smaller, and/or more feminine.
Arrrrggghh!!! It's all just a bunch of stereotypes and cliches.
In the real world people are nowhere near that rigid.