Surely it's fine to recognise that Mother's Day means different things to different people?
I've 3 DC, 15,13,11, & I've asked them not to get me any gifts - but I did say, I'd love a day of no squabbling / offers of help as needed! I genuinely mean that. I've no interest, even if they could afford it, in expensive gifts or flowers. I'm a single parent & we are going through an awful time with my exH (courts etc). I'm just grateful we are surviving.
When they were smaller & saw their father a bit, I used to get sad that he wouldn't make the effort to get a present - on their behalf, as they got upset. I'd usually organise a gift for myself from them as they wanted me to have something.
But I fully get that for other mums / families, Mother's Day is much bigger - meals out, flowers, gifts. And that's fine too - I hope they all enjoy their days.
For me, it's what happens throughout the year, not one day. My kids are far from perfect, but they love me, and accept my flaws as a mother & I'm grateful for that. And I'm proud of how they've handled an awful year.
I'm thinking very much of those who have lost children or wanted children and weren't able to have them. It must be very tough on days like this.