Random ahh Question

So like, if you make a post, can you delete someone's reply to your forum post?

Cuz I feel like over the years I've seen ppl beef in forums and say something like "YOUVE BEEN DELETING MY REPLIES B >:["

and I always wondered. Is that actually possible? I've never been able to? Has anyone been able to? Or is it always a misunderstanding and someone's reply just doesn't load/ go through?