I was thinking the same thing but couldn't put it so well myself. People need to chill and give the guy a break.
I wonder if people are expecting the uke to like seme after a 1 night stand when they're totally strangers. (imagine you're expecting your sunbae next to you but you wake up with other guy) hahaha
people always use 'tsundere' to fit their own agenda. if he acts like an ass hes not a tsundere, hes just an ass, if he doesnt like the seme hes not a tsundere, he just doesnt like the seme. why people always gotta use 'hes a tsundere' as an excuse? smh.
then is he supposed to like the seme after that accident? what if you wake up into a stranger's bed?
I think the uke fell for the seme the moment he noticed his hair and complimented him "nice and clean. looks good on you." the uke seems to be a kuudere+tsundere type who likes to keep his cool but actually a softy...so don't dislike him that much guys