I mean he clearly said, sex or what and she picked the what, not much to answer there just take the L
If you're going to use a line like that you absolutely must have a plan for what. Like come drink with my friends, or dancing, or games, or self deprecating humor. Not having something is on anon.
Assuming you at least thought about what you said first and this is your intention, then stand by it. You could go like
"I dunno, but I think you'd be great at it" or "Yep. And dinner?" or "Too quick? I wish the laptop I T gave me was like that"
I don't tend to spend too much time thinking of responses. Most people just seem to enjoy nice sounding ones
Hey, it's not my fault you can't get a conversation like this to work. I have to agree op put up quite the situation tho