Don't you think having a college football mascot at your wedding is an asshole move?
What makes it seem too tacky to you?
I'm not sure if I want to be at this wedding if it's going to be that silly.
It may seem odd for a wedding to have such extravagances. The wedding of others is a personal matter and it is entirely up to them how they want to decorate it. If you can't look past their way of doing things, then you shouldn't go.
I'm going to diss this wedding on social media and tell the world about how horrible that wedding is.
Saying horrible things about someone's wedding is really uncalled for. To be honest it sounds like you might have some jealousies to deal with. You should probably try setting those aside, so you can go enjoy the wedding and reception with everyone else.