Hey! Sorry to hear you had this experience in the game.
The Training Server can definitely be rather tiresome, especially when trolls walk all over a session where you’re trying to control properly.
Might I suggest opening up an ATC Tracking Thread on the forum? That way, you can invite members of the community to fly whenever you open up airports, and they can even give you feedback when you’re done. It’s a great way to build ATC operations and practice for the IFATC practical.
If you’re not sure how to go about it, here’s an excellent tutorial on how to create a tracking thread of your very own:
Pro tip: open up smaller airports - you’ll definitely want to avoid airports like KLAX, KJFK, EGLL, KSFO etc., or even any major 3D airports, where you’ll be susceptible to trolls. Invite community members to come fly at those smaller airports while you’re controlling. I’m sure your experience on the Training Server will be much better once that happens!
Another pro tip: try and find airports with parallel runways, since they’re very good for practicing pattern work/local controlling, which is what you’ll primarily be tested on in the practical.
Good luck, and hope to see you in IFATC soon!