When you start playing blitz there is one simple tip that will save you from upsetting team mates - leave space.
For example, if a medium is approaching a corner, do not follow close behind. he/she might need to reverse. If you are desperate to shoot, go on one side, leave a space behind medium.
Similarly, heavies will poke out, shoot, then reverse. Do not park behind them.
And never knock into a Tank Destroyer. TDs need to stay still to use camouflage. Running into them resets the camo.
On that topic - NEVER push a TD out of a sniping position because you think it is a good spot for youself.
So, in summary, just give your team space. Sometimes there will be tight spots in brawls, bur do you best to never block or push a team member into harms way. You will avoid a lot of anger this way and win more games.