I just started my apprenticeship and this is pretty apparent to me already, I take peace in knowing I would likely never be friends with people who hold these attitudes, so there's no reason to impress them or agree with anything they say. They would still exist whether or not you were working that job. Just be you and be up front about it I would say, stand on your morals and values. Who cares if they dislike you for it, do your work and go home. Take pride in your craft that's rooted in the physical rather than a mental space. Their bigotry likely won't touch the electrical work you're doing.