Cheering, people being happy about something is usually something that is pleasant to be around. As apposed to shouting, swearing and stamping / storming around which is unpleasant to be around.
I agree shouting and swearing isn't pleasant to be around, but I - and I presume others - are answering the OP's question about "if she is BU to think football should not affect your mood" and "if she IBU to say he shouldn’t get too emotionally invested in something he has zero control over?"
That is where OP IBU. Of course it is fine to be emotionally invested in things.
If you are emotionally invested in something, then it is likely to affect your mood. Again, that is fine and normal, so the OP IBU.
Quite separately, if you asked if people like being around people who shout and swear, I personally would say "no". I mean, I know there are plenty on MN who love to demonstrate their love for swearing, so even that wouldn't get you full agreement. But what you seem to be confusing here is some kind of link between being emotional, and your mood being affected by something that upsets you or makes you happy, and then implying that everyone who is upset / disappointed / unhappy then behaves in a loud, aggressive, and offensive way.