I don't worry about experienced players kicking me around.
However, I do mind when players don't take the time to check the win/loss records of who they are playing with and check what comes out of their fingers when they type.
On example is a guy came into my FFA game I had created and was patiently waiting for more players and leeched all my players by saying a 3v3 needed 2 more players. I made the mistake of following this guy too as I had been waiting 15-20 minutes already for 6 players.
Now mind you, this is my 3rd game of sins MP and I still haven't absorbed all the information on proper counters despite reading the forums.
So we start playing and I spend 10 minutes trying to direct my allies to, you know, start actually communicating. They refuse to come up with a plan initially while expanding for what units we were each going to build. Strike one.
Strike two, I came up against the game host's units and had to lock horns with the guy. I had built too many Gardas and he had spammed LRM's out the wazoo (we were both TEC). There was no way I could get enough splash damage to eliminate him, I expected him to change his tactics when my kol started to chew through his LRM's but he didn't. Meanwhile I didn't pay attention to how many gardas I was building because I was going the mantra 'Anything but cobalts' from what I'd read on these forums under strategy so far.
Strike 3, I was trying to do some friendly banter with the host and finally the host overran me. The player leech during the course of this three hour game started to feed me resources without asking me what I needed specifically (I was woefully short on crystal the entire game) and he had spent the entire game helping our 3rd ally while the other two teammates dropped from the game and let AI take over.
By the end of the game when I was trying to see if Finest Hour would let 30 gardas, 17 flaks and a kol take out 51 lrm's (I took down 11), I was bored around hour 3 and wasn't in the mood to keep retreating while the other two teammates built a fleet. I understood they had their hands full but they assumed I didn't do anything, while if anything I had put up an extremely good fight on the host till that point.
The player leech, when I didn't want to retreat my fleet:
Cursed me out and demanded I leave the game,
After not examining exactly what I was up against or advising me on how to change my unit makeup
Didn't know what countered illuminators when I asked (I remembered it was fighters after the other 2 had managed the illum spammer already) and claimed you had to just upgrade past him with kodiaks
and continued to feed me resources indiscriminately, when I only needed crystal.
Pro players don't make me afraid I'll lose, it's the intermediate players who think they're skilled and don't communicate at all that make me not want to play online, and the fact that I never see more than 20 players in the lobby when there's sub-30 games going on and sub-100 players online and a hosted game doesn't fill up as fast as it probably should.