The disciples, the same Matthean author you cite, plus a variety of other early authors/community traditions who interacted with the “twelve”, not to mention Paul, clearly got a very different impression from their cherished teacher — a teacher they were willing to die for after his own crucifixion — than you did.

How do you explain this discrepancy?

Conspiracy to defy their Lord for personal gain (or death); the Lord through whom they (pious Jews) believed all things were made? Did they think they knew better than their teacher — take the whole Jesus message to the next level, so to speak? Was there some Catholic corruption of the “true” anti-Gentile message of Jesus’s Gospel? Were the early Jewish Christians a bit… dull, while also being careless/dull with their Jewish covenential religious context? Another hypothesis I haven’t mentioned?

Or, have you mistakenly extrapolated cherry-picked texts to derive a mistaken conclusion?

The latter option does a much better job explaining the data. ☺