one for all champ pick undesirable, fine, harassment is not
If you get a champ you want to play and someone doesn't want to play that champ, if you harass them because they don't like that champ, you're an asshole
Conversely if you get a champ you don't like, and spam surrender the entire match, complaining about the champ, then you're the asshole again

. Not endorsing harassment, however when a champion designed for one role is selected complaining should be expected. The only person having fun will be the one who picked the champ (as they likely took smite) while the rest suffer with a useless passive and weak laning.