So my neighbor offered me her green grape crop....

[Retrograde]

18. Seedless grapes are a relatively new development

well, early 1900s. Etiquette books used to advise eating the grapes (after using one's grape scissors to remove a small cluster), then discreetly spitting the seeds into one's napkin or handkerchief.

We had a huge Concord grape vine in the house where I grew up. My mother made jelly from them, cooking the grapes with their skins and seeds, and then pushing the whole mess through a cheesecloth to remove the debris. We kids would eat the grapes outside and just spit out the seeds - the same as we did with watermelons.