No point having his debate until 3rd wave feminists are willing to sit down at the table and hear out those who criticise the movement without dismissing them as ignorant or stupid or misogynistic or basement-dwelling.
Worst of all is just saying that it is their opinion and leaving it at that. Guess what, truth-claims by definition are not relative, and mutually exclusive truth-claims cannot all stand, if its not a substantiated truth claim you don't get to call it an opinion and leave it there, you ask them to substantiate it and if they cannot, you declare it invalid. Saying an unsubstantiated truth-claim is a fair opinion gives it too much credit, and saying a substantiated truth-claim is just an opinion gives it too little. Telling someone its just their opinion is a nice, politically correct way of being lazy.
Here's the funny part though, at some point 3rd wave feminists are going to have to sit down properly at the table, because as a movement proposing some kind of social reform (ostensibly gender equality), they're going to need to get everyone on board to make progress, they can't afford to have large groups of people thinking they're a joke - which is what the increasingly popularised alt-right movement sees them as (e.g. Milo Yiannopolous), and what more mainstream conservative groups are beginning to consider them (e.g. Ben Shapiro). The onus is on them to make their arguments, and its not just a philosophical onus, its a practical one.