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.
Product placements in television shows where the ad becomes part of the fiction.
I officially stopped watching Eureka when there was an episode about Degree For Men. I similarly gave up on Bones when the characters started delivering Toyota ads to each other.
I’m okay with there being a stick of Degree For Men label out in Sheriff Carter’s bathroom, or if the cast of Bones drive Toyotas. But when they stop to talk about long lasting anti-wetness or zero percent APR financing I’m fucking done.