Lefty
Usually spread across social media and typically used as a insult to anyone who may be perceived as holding left-wing views. If the use of the term 'lefty' isn't backed up with any justification in an argument, it's a good indication they cannot form a rebuttal and only want to cease the argument. Further prodding after being called a 'lefty' usually results in being compared to a child, snowflake, stupid, degenerate, or anything which the initial user of the word 'lefty' isn't already.
'There is not yet an iota of proof that Halal funds terrorism.'

'It's that kind of lefty crap that kept ISIS going for so long.'