If I may; Skial servers are pub servers so the people who join expect "normal" TF2 gameplay - Red and Blu killing eachother, and players (hopefully) following the objectives. When you start doing things like being friendly to the enemy team, and / or doing nothing but high five taunts then you're being useless to your teammates.
It is a pub server so its not super serious game play, but it still is normal TF2 game play that is generally taken seriously. Your actions take away from that seriousness and impede your team in a negative way by not contributing.
The people joining Skial servers are joining to expect normal TF2 game play, so if they see a bunch of players not killing one another and giving eachother high fives then chances are they're going to go to a different server.