Going back roughly a decade you can find blog posts and some bits on Twitter. I don't see anything outright gay-bashing but his moral worldview, when he speaks on the matter, seems to be shaped by his Catholic faith. I don't think he hates homosexuals, and I can't guess at how his beliefs effect others (who for, or how, he votes and such), but he certainly seems to have a moral opposition and hasn't since stated otherwise that I am aware.

If you need a smoking gun, here's a quote from Twitter around 2017. Context is that this apparently stemmed from the removal of developer Larry "Crell" Garfield over "Gorean" (?) beliefs or participation in that subculture. Relating to some BDSM, male-domination, female slaves "Gor" novel series, that I cannot be assed to dig deeper into, and concerns he'd carry the "misogyny" into into the workplace. Anyway:

The Drupal community is treading perilous waters right now. Risk of excluding more members than just Crell. Careful with moral equivalence! It's a heck of a lot more nuanced than that. But basically, if the criteria for being part of the Drupal community anymore is "Must both publicly and privately support Gay marriage, etc." then... I think I might be excluded.

As an atheist looking in, I find Abrahamic faiths fundamentally incompatible with homosexuality. Having a gay Christian marriage, for example, is an absurdity to me. To be clear I'm not personally opposed to it. I find very much wrong with his faith but I don't believe Jeff is wrong about his faith. But kudos and power to whoever wants to lie to themselves and retcon Christianity in order to believe (what I perceive to be) a bigger, more comforting lie. If we can keep eroding at it maybe we'll finally get over the hatred and hangups it causes, or at least no longer be able to point to it as a justifying source.