What’s good in a debate or an argument:
Giving an alternate perspective to the other person’s positions/beliefs
Giving and explaining relevant sources about an issue
Criticising the other person’s positions/opinions/etc
Debunking incorrect claims or outright lies
Pointing out and criticising hypocrisy
What’s fairly neutral in a debate or an argument:
Being sarcastic and/or bitchy
Annoying or childish name-calling
Tagging someone else to show them what’s going on/so they can offer their insight and/or add additional sources
Adding gifs or silly memes
What’s unacceptable in a debate or an argument:
Deliberately going out of your way to genuinely trigger the other person (especially if they’ve expressly stated that a particular thing is a genuine trigger)
Mocking the other person’s appearance
Any anonymously-sent abuse or genuine harassment or encouraging others to send abuse or genuine harassment
Falsely claiming that the other person is a bigot/abuser/paedophile/etc over literally nothing but their fictional likes
Randomly accusing the other person of being a bigot/Nazi/etc without any actual reason or genuine proof