For me it is when companies/services market themselves as donating to XYZ cause if I buy their product. If they want to donate, they should have already done that with the money they have. Asking me to give them profit so that they can donate is so obviously pretentious.
Cold calling. And other proactive forms of sales when they seek you out and actively keep trying to convince you that you need their product.
Bonus points if the sales person is unable to actually explain the product and keeps talking about “we don’t sell products we sell solutions”