Interesting how single words can have such an impact. I find it jarring to hear someone begin a sentence with "So", as if they have given the current topic some thought (when 9 times out of 10 they haven't), or to hear them end a statement with ", no?" where turning a positive assertion into a question sounds somewhat underhand.
Many people for whom English is like their third language (coming from Russian or Ukrainian background specifically) tend to abuse “So,” as a sentence opener, like other people may abuse “Well,”.
Same thing with “…, no?”. More cultural than linguistic. I’ve also heard it’s a Mexican quirk, too.
Still annoys me, but I can see where they’re coming from.