I judge people who judge others for gatekeeping. God forbid I have a well informed and strong opinion based on experience. If I share that with a casual or new person then it’s now called gatekeeping.

It’s ok to have different opinions but not all opinions are equal, and if you’re a casual participant or new to a field/hobby/whatever your opinion doesn’t matter as much. Additionally, if you are discouraged and feel held back by strong opinions by others then maybe you should be kept out.