My main disagreement with Trotskysts are related to their view of AES states and global south liberation struggles. They have a very narrow (and utopic, IMO) view of what a socialist transition should look like. Anything that deviates from that very narrow view is seen as the enemy and as a "Stalinist" degeneration.
This has been very problematic in many of the past liberation struggles, like in Vietnam, where they acted to sabotage or undermine socialist or workers' parties aligned with the USSR. Or even in countries like Brazil today, they spend a lot of their energy trying to critique and undermine other socialist parties (including, surprisingly, other Trotskyst parties) instead of simply working together to build a workers' movement.
So basically they are a bunch of people against everything and everyone, be them more advanced revolutionary parties, or more backward reformist parties. I could summarize the movement as a ultra left deviation of Marxism.
You too, my friend!