I 'm sorry not read the entire thread, but the replies on here are so strange ... almost as though posters are reading what OP put and just totally projecting their own reasons for rejecting their parents onto OP.
To say the OP can not possibly an example of the incredibly rare cases where a healthy, loving parental/child relationship shatters and breaks over incredibly minor tiffs would be an exercise in over confidence of one's own infallibility. And there would likely be some projection involved.
However, what I think most of us, who are the child who initiated and maintained estrangement, are noticing is a known and studied pattern within the larger group where parental estrangement features.
The flags are
1 - The parent does not understand why the estrangement happened. They can think of nothing they have done that would justify a significant chink, let alone a gaping chasm between themself and their child.
2 - The parent focuses to a notable extent on all the lovely things they have done for their seemingly ungrateful child.
3 - The parent hones in on their child's spouse as an operator in creating distance, but cannot point to any overt evidence or history of manipulation, abuse, or other controlling behaviour. They only imply reasons for why the spouse must be somebody determined to create distance. This is achieved by contrasting the spouse's unfathomable responses with the warm loveliness and (this is a notable feature) CONSISTENT GENEROSITY towards the spouse of the child of the now estranged parent.
4 - The estranged parent has a history of other troubled, turbulent relationships that have also result in estranged or troubled contact. Which they present as not their fault.
It's not strange for posters who live on the other side of the parental estrangement coin to notice that pattern. Most of them have lived it. Most of them will have seen, or heard about their significant reasons being reduced to "over nothing". A lot of them will be aware of the extent to which the phenomenon has been studied and analysed in professional circles. And the odds are hugely on their side in terms of this specific representation of the pattern not being an outlier.
I don't think any of us want to see the OP locked into that pattern if the reality is she is not in the rare group of outliers. Not for her sake, not for her son's sake. It's not a club you really want to be welcoming new members into.
Unfortunately that pattern tends to be hardest to reveal to the people stuck reproducing it. Because, despite the estrangement seemingly coming out of the blue, for no real reasons, there is often an unacknowledged, consistent history of inter-family dysfunction. And a considerable trail of attempts of the child to set boundaries that get trampled as fast as they can put them up. The truth is these sorts of estrangement scenarios, where this pattern can be seen, overwhelmingly feature much longer term, unacknowledged, significant family dysfunction. Which is hard to untangle and resolve even when all concerned are still willing to be in the same room to participate in a professional led session aimed at achieving something better for all.