I don't want to engage with people who expect me to know Spanish.
Why do people expect you to know Spanish?
It's not the people expecting the Spanish that bothers me, it's the English speakers who think that I need to speak Spanish to help them.
I can understand why you're uncomfortable being stereotyped, but at least these people are trying to go outside the comfort zone of their own language. It's OK to have a little patience.
Look I don't want to be rude but I don't have to put up with this from English speakers.
I feel like you're being a bit unfair to English speakers here. If you're being asked for help then maybe they're comfortable hearing it in Spanish. Just because they speak English doesn't mean they also don't enjoy speaking Spanish.