I would use the shine a light on it technique. In the short term it makes things tense but in the long run it helps.
You say ''Regina, I feel like you're trying to undermine my capabilities, is that your intention?''
(ie, you just shine a spotlight on the elephant in the room)
Then they (hopefully) say 'oh gosh no no no I just felt like I could help you and you're reading too much in to it blah blah''
You have to resist the temptation to get drawn in and merely respond to their denial of the ''charge'' you laid out to them.
You have to say ''I'm so glad that's not your intention''.
Whatever else they say, that you're sensitive, that you're ungrateful for their experience etc, do not respond to that
The idea is that this simple exchange alerts them subconsciously to the fact that you have more backbone than they thought and that you can handle conflict better than they thought.
That's why it's super important to smilingly say ''I'm so glad that's not your intention!'' with an aura of it's all good in the hood even if you want to kill them. Smile.