Why many White men assume Asian men are offended seeing Asian women with White men?

Anonymous
As an Asian male, while there are an amount of good Asian women, I don't hold high opinion on them, and haven't dated any since I came to America & Australia, but only European and European immigrant women. But for me, I never intentionally brought my opinions on them up, and only talked about my opinions when someone else brought up the issue into some conversation. Even such, I was asked, online and in real life, whether I am triggered seeing WMAF couples, by White men numerous times, some knowing I have only dated White or Western women for years, while others don't. I know they were asking with a "we take your women" attitude or assumption. If someone like me would encounter such questions so often, I can't imagine how often the Asian men who date mostly or exclusively Asian women would encounter, unless date only interact with other Asians, which is the case for many of them.

Why would so many White men assume Asian men are offended seeing Asian women with White men? Do they really think they have a chance (not necessarily mostly but still more often than not) with their mediocre intelligence, mediocre wealth, and/or mediocre look? Also, what's the deal with that White Knight thing, like listening to their "Asian dolls" complaining about how bad Asian men are and "comforting" them? My girlfriends had said men of some areas (I mean large, general geographical regions, say West vs East Coast, South vs North, etc) they lived are rude or some men are more attractive than others (say, Italian over French men), but neither is she interested in complaining so long, nor am I interested in "comforting" her again and again (except one got sexually harassed by three during high school, but that's a specific event) or talking about why I have no interest in Asian women in general. I and my girlfriends in the past simply have no interest in complaining or listening others complaining so long.

(Additional points to be added)
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PS:
(1) I reckon that many White/Western women are feminist (or feministic), but that doesn't prevent me from finding someone who are not, albeit with an effort. Why can't some White men spend less time pointing fingers and examine if themselves are part of the same problem, only the other side? Why not think that if Asian women are truly feminine, then Asian men are effeminate/emasculate? Or if they White men are much more masculine than Asian men, their women can be much less feminine?
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(2) I know some White men may answer "ha, you're so insecure", yet it is not me being insecure, but some White men. (A lot of Asian men are insecure, too.) However, after being asked about similar questions over and over, why shouldn't I feel so annoyed?
(3) How do I know some of the things I said? Because I heard so many times in real life and online, such as some Asian women complaining how bad Asian men are and their White partners offering "comfort" to them again and again. Ha, white knight
Why many White men assume Asian men are offended seeing Asian women with White men?
7 Opinion