No offense, but I don’t think they were being nasty, I’d say the person messaging you was matching your energy. But in the grand scheme of things, brands don’t owe you anything except the products you paid for. If you choose to help promote them with no agreement beforehand sometimes that’s all it is. And honestly, there’s little to no benefit from being reposted unless it’s a HUGE account. It’s frustrating but try not to let it bother you!