Yelling and screaming, cheering etc, YUCK!!!!!!!!!!!!!!!!!!
So you don't want people supporting their team then - hmm, yep you really don't sport do you.
Down the years fans have supported their teams vociferously - when I was a kid fans still used football rattles, which made a bin rather louder than an individual fan might make. They were (quite rightly) banned on safety grounds, but I image being in amongst tens of thousands of fans in the Kop in the 1960s would have been as loud and raucous as it is today.
And that's a good thing - if you support a team you find the whole experience emotional, the highs and the lows, and you want to be part of the experience, not least because for a team having 50,000+ fans cheering you on will spurr you to greater performance.