I think there's a bit more nuance than "seed oil bad".
I personally don't wear sunglasses and very rarely apply sunscreen. But one thing I don't do is f$ck around with the sun. That means I try to avoid the hottest hours of the day in summer, and get some in the morning or afternoon. There's also the factor of time in the sun as well as recent sun exposure (already tanned?).
If I need to be out in the middle of a hot summers day I'll wear sunscrean and I think I'll be OK.
About seedoils, honestly IDK. Apparently the Japanese live the longest and they eat rice. Is rice a seed? I know its a carb, and carbs are meant to be bad too