I thought spoiler warnings were a waste of time, but I was wrong

I once rolled my eyes at spoiler tags in forum talks. It seemed like too much effort for little gain. Then, I casually mentioned a major plot twist from a recent series without any warning. A fellow viewer messaged me, upset that I had spoiled their experience. That message hit me hard, and I realized how selfish my posting had been. I began using spoiler tags in all my comments from then on. Now, I notice more people engaging with my posts since they feel safe to read. It's made our community talks a lot more welcoming for new fans. What small habit shift improved your forum participation?