Viewed charitably, you were not being rude, although you did veer away from your main point in ways likely to be unproductive. (For example, being unnecessarily dismissive towards Hanson, who you'd previously stated had given arguments roughly as good as Holden's; or spending so much of your final paragraph emphasizing Holden's lack of knowledge regarding AI.)

On the most likely viewing, it looks like you thought Holden was probably playing reference class tennis. This would have been rude, because it would imply that you thought the following inaccurate things about him:

• He was "taking his reference class and going home"
• That you can't "have a back-and-forth conversation" with him

I don't think that you intended those implications. All the same, your final comment came across as noticeably less well-written than your post.