It's not just him. BRTD and Verily came in here and made positive comments about this.
This script goes far beyond anything levelled at Obama by any Clinton supporter. No Clinton supporter that I've ever heard has even gone so far as to say Obama is Muslim. This one says Clinton is complicit in rape.
If someone posted something about Obama being a Muslim and attending madrassas in Indonesia, etc. and a bunch of Democrats came on and made approving comments, I'd also wonder what I had in common with them.
Okay then, I'll be on the lookout for supporters of every major candidate who are okay with these kind of tactics to ensure that you find yourself unable to support a single candidate, since you seem to want to form your opinions of candidates from singular extreme examples of those candidates' supporters.