No, it's not problematic at all. The behavior was unacceptable. The victim being so used to it that they don't notice the offense doesn't make it not an offense.

You can never hide behind "the victim said it was ok". You need to examine the behavior. Consider the environment in which it took place. Consider the statement the behavior makes to those observing it. Maybe even consider why the perpetrator was behaving that way, but don't give that too much weight.

The important part is that public behavior does not exist in isolation, by definition. Public behavior shapes the world in which it takes place, and the perception of it is shaped by the world in which it exists.

Let me jump to a hypothetical case, totally unrelated to what was presented here:

Let's imagine a couple who in private mutually enjoy the male partner dominating the female partner, including verbal and physical abuse. There is nothing wrong with this. "It's not a problem, she enjoys it" is a perfectly true statement.

Now move that couple's behavior into the public realm. "It's not a problem, she enjoys it" is no longer true. She can completely enjoy it, even feel empowered by it, and the situation still presents a problem. The abuse must now be considered in a wider context. If no one challenges it, it is tacitly accepted behavior. That acceptance influences other people - a man sees that there are no consequences for abusing women and thinks the behavior is a bit more acceptable; a woman sees the same and thinks her only option in that situation is to put up with it.

To move the subject back to the original post, then:

It really doesn't matter whether the victim believed she was being attacked. What matters are the conclusions observers would draw from the interaction. Up until the OP spoke out, an observer would see evidence that it's acceptable for a male speaker to talk over the female speaker he's supposedly asking a question of. The OP speaking out (and the room's reaction to it) provided a very strong contrary signal - it's not acceptable.

In context, does this one incident mean a whole lot either way? No. But our reactions to it do. If you read about this and say "hey, that was a good thing, I should do the same if I notice a situation like that" then you are helping to fight sexism in a real way. Every single time someone says "Let her speak, please" it is creating a tiny shift away from sexism. On the other hand, if your reaction was "this was a non-issue, just ask the woman on the panel", you're not doing a thing to help the culture shift away from sexism.

I'm in the former camp myself. I've been on a work call where a male participant jumped in and started talking over the top of a female participant. I'm ashamed it took me almost a whole minute to work up the nerve to tell him we should let her continue talking. Next time I'll be faster about it. And Marilee's story definitely makes me feel better about doing so in the future.

Don't call this "problematic". It's explicitly shifting cultural norms in the correct direction, a little bit at a time. Stand up for what's right and do the same next time you notice a public situation which would serve to normalize sexism. Trust me, I know how uncomfortable it is. But I also know it's worth it.