Seiren's feed

What I don't understand is why the ml and his friends treat the mc like that. Cause...

I saw the raws and I got the impression that they actually liked his origami and that they don't hate him and the ml actually like him and doesn't want him to think he is not cute. So is the mc just misunderstanding everyone's behavior? Is his anxiety? Does the realization of knowing and accepting he is not that special? The mangaka just ignored her/his own plot?

I have question, OK lol