What does 'undermining your intelligence' mean?

No one has got it yet. Someone undermines your intelligence when they behave as though they don't expect your thoughts about an issue to be worth taking notice of. It basically means they don't think that you know enough about a topic and/or have the insight to use and imilate the knowledge which is available to you in any sufficiently meaningful way to be bothered caring what you think.So on one level they may think you have an adequate brain, but are ignorant about a particular topic or they may just think you are a fool in general about most things. Tell them to stop undermining your intelligence and to have the courtesy to listen to what you have to say.