Context is missing here, and the question was very poorly phrased in any case, but in some circumstances the idea behind the question could be legitimate. Like if this conversation was happening on a dating app, and they are discussing her physical disabilities, it would be reasonable to ask a potential match if their body was capable of feeling sexual stimulations.
They asked a deeply personal, rude, and misogynistic question in a public space and you want to know if it was in bad faith? I think the clap back was very warranted.
Also, that's not verbal assault, it's just an insult. If she threatened harm or made them feel unsafe, then it would be.