That passage appears in the context of Jesus and his disciples making the pilgrimage to Jerusalem to celebrate Passa, which takes place in April. Just after the fig tree incident comes the purification of the temple.
Everyone who has a fig tree in the garden knows that some varieties bear an early crop, which is what Jesus was hoping to find. And no one swears at trees, as the webcomic helpfully points out.
The only possible interpretation is that that tree wasn't a fruit tree at all but some random wild tree from the fig genus that doesn't bear edible fruit. The Jesus that appears in the gospels is averse to showy and thoughtless practice, and this is yet another instance.
You can make fun of the anti-homosexual tendencies of evangelicals as much as you like and they'll just reply that queers are gross and the bible says it. But if you point out that the prohibition of homosexuality appears in the context of cultic practices you meet them on their own ground and imply that they don't understand their own foundational text.