Why did CM Punk get booed for not drinking. .?

So do I bro in Fact I am Straight Edge as well and alot of people tell me that they have respect for me for my choice, ppl who don't respect others for not drinking are drunks or just plan immature, Its the same as me not disrespecting or putting down someone who does drink it is their God givin right to do it and I support their choice so for those who booed him tonight they need to find a mirror and take a long look they aren't perfect