If you like the technology and product, how do you deal with a vendor salesperson (or another company contact) that violates your beliefs or values? i.e. acts disrespectful to you or your team

There are many reasons why you might not like working with your sales person. If it gets to a point where the relationships is not tolerable, I would have a conversation with the sales person. If that did not fix the issues, I would ask the vendor to assign a different sales person to my account. It isn't a pleasant experience, but I have had to do this on a number of occasions over the years.

I would contact their immediate boss and explain to this person the situation the salesperson had that made me feel that way. With this, I would ask for a new salesperson to keep the business relationship accordingly. I will write an email to my Manager, HR, and the contacts in the vendor's company so everyone will be in the loop.

If the salesperson is not acceptable you should make it known to the company and depending on the action they take, you should evaluate whether to stay of find another vendor

We typically use a VAR (value added reseller) and ask them to find someone else at the vendor that aligns with my values/beliefs.

Move on