I highly appreciate you asking for feedback and acknowledge a possible opportunity for growth. Very rare, doubly so on the internet imo.

The intention you use something with - sadly - does not communicate over written text well. If you use common derogatory language in a „funny“ way doesnt change that it is derogatory. Think calling a black person the n word or a woman the b word but „meaning it funny“.

The word turbo nerd is exceptionally derogatory and akin to making fun of disabled people.

screaming at themselves or cursing can be a sign of tourette, the IT world has a very high rate of autistic people and hearing them scream can be a sign of a meltdown. Thats not something to make fun about.

In any case it never is your business to make fun of someone except the person gives consent (ie is a friend who is cool with being treated that way or does the same with you). Taking away people‘s agency that way is indeed what can lead to horrible outcomes. Just dont do it. You can be funny in a different way.