The issue I have with playing 5 a side or indeed any form of football is the people who think they can blatantly elbow or set out to injure you, just for their pleasure. It's the reason I gave up Sunday league, well part of it. I wasn't fit enough, I wasn't bothered enough and I was fed up of the angry idiots who just wanted a ruck.
My work has a works 5 a side tournament every year and it always boils over. I used to be straight in to the centre of that rubbish but now I just give people a withering stare. Then ensure I win the next 50/50 with them, firmly but fairly.
I watched a Sunday league game the other week whilst taking my kids to the park. First thing was the language was constant. Yeah it was never great when I played but it was every sentence. The second was that the ref just didn't have a chance. Abused from start to finish, I wouldn't do the job for love nor money.