That's an oddly specific question given sea levels have "only" risen 15-25cm since 1900 and most piers are more than 25cm above previous sea levels (and less than 120 years old). You will soon get your wish soon though, we're raising sea levels by 3.7mm PER YEAR. And that rate is only going up.
>Between 1901 and 2018, the globally averaged sea level rose by 15–25 cm (6–10 in), or 1–2 mm per year on average.[1] This rate is accelerating, with sea levels now rising by 3.7 mm per year.
I have no stake here; but he asked for a photo, and you replied with a Wikipedia link and an animation. Surely you understand the difference of evidence to him right?
Sure, if you are saying that you can’t see the difference that two photos of similar tides just like you can’t a photo of the curvature of the earth that would be a good argument.
Like I say, I don't know of any piers built only 1 foot above sea level (they start flooding as soon as there were waves no?), and built about 100 years ago... If you do please share!
>Between 1901 and 2018, the globally averaged sea level rose by 15–25 cm (6–10 in), or 1–2 mm per year on average.[1] This rate is accelerating, with sea levels now rising by 3.7 mm per year.
https://en.wikipedia.org/wiki/Sea_level_rise
(I like their excellent graph / globe animation...)