No, not at all. That I'd have no issue with. Now, Hellman's makes a number of different variants IIRC, and I can't tell you which particular one this was as I haven't bought it since, but: I mean 'pumped' as in 'foamy' or perhaps a better term would be 'areated'. Filled with visible bubbles of some gas - I don't actually know whether it was nitrogen or something else, but nitrogen would make sense due to the same reasons you pointed out. I suspect it was done as a shrinkflation strategy to sell the same apparent volume of product, whilst saving on material production inputs. It certainly did nothing beneficial for the texture. I don't really want my "mayonnaise" to feel like poorly whipped cream.

I've seen the same thing done for some cream cheeses, and likely for the same reason. I don't buy those more than once either.