Ask HN: How Do You Deal With/Manage Vendors Politely?

I go to/speak at a lot of conferences and constantly get vendors aggressively pursuing me immediately after I step off stage, like a line of them, trying to sell me their xyz security/endpoint/infrastructure/devops/AI/blockchain product. It's really a time suck. And that's before the emails and calls start coming with vendors continuing to pitch their product and trying to set up meetings with me. Some of them get really sneaky and passive aggressive when I don't respond, like "Well you haven't answered any of my emails so I guess you DON'T care about the security of your product", or "Your boss XYZ recommended we connect", and when I talk to my boss, they have no idea who the vendor is.

I don't think I've ever bought a product from a vendor as a result of interactions like this, like perhaps many of you. If I hear about something that solves a problem I have and I would rather use a managed service than roll my own solution, I will engage a managed service to do that, but never as a result of pushy vendors. So maybe I need a CI/CD managed service, so I take the ones I know, and search for others that may be new, find one that fits my needs, and start using/paying for their service.

So the question is: How do you deal with pushy vendors, or vendors in general? In my position/business I can't be a straight up jerk to them (and also that's not my personality), but also don't want the time suck. Advice? Anecdotes?