Perhaps I just have poor taste....???

And SIL never likes or uses anything people give him as gifts so like blossom14 he no longer gets anything from me unless I treat him to one of those restaurant vouchers as he has a weakness for a certain chicken with hot sauce restaurant ?

I would never dream of photographing flowers I was sent - I don't have a mobile phone though or communicate through any social media type outlets so it just would never occur to me. I do phone or email to say 'thank you' of course. But I do honestly wish in a way that gifts were not given and received so often - I just get this depressing feeling of people spending money they can't afford for other people who already have too much 'stuff'. I certainly never felt like that when everyone had fewer 'worldly goods' but nowadays I think even baby DGS has too much and I stop myself buying even more 'things' on a regular basis.

One of my Son in Law's was so rude and unkind about any birthday gift I gave him (I always asked my DD what he would prefer); so now, he just gets a birthday card.

Our GS is always a bit of a letdown when we give him anything. He’ll open a present and just look at it with the barest flicker of a smile and grunt. He always has to be prompted, by his dad or us, to say thank you. He’s 12 and we’ve all been prompting him since he learnt to talk 10 years ago ?
And yes, like others, I always photograph flowers and WhatsApp the sender with a message of thanks. It’s really not difficult these days is I?

I love giving gifts and I agree that its truly deflating if you have been excited about giving someone something special and they barely even say thank you. I don't want someone to go wild over a gift I give, but agree it's not nice when you don't get any kind of gratitude or even feedback to say "thank you but it's really not my thing" , if they really didn't like it.

I usually photograph flowers too and send a thank you. Many young people don't say thanks. Sometimes the parents haven't taught them. But sometimes its just not bothering.
I tend to be quite generous with presents and think how pleased the person will be and am disappointed at lack of response. Am I doing it for me? Perhaps it isn't that exciting to get a present nowadays as people have so much stuff now. I think you have to decide do I want to bother any longer or just give a gift token.

I rate Bloom & Wild, too MB! My son sent me an azalea plant through them and it came as a clever diy kit, which was easy peasy to assemble and the plant is still going strong months later. (It came as a sort of flat pack, with a woven ‘pot’ that just needed to be unfolded)

I did the same as Buffy and sent a photo with a thank you, so that my DS could see what he’d actually sent.

It's not quite the same but I've been wondering about it: a neice came for lunch. She's a nice girl with a good job but not in town here very often. I made a real effort for her. Got a nice lunch and treat things (well what seem treats to me) and gave her a cheque for what felt to me like a good amount. She seemed pleased. We parted on good terms. AIBU to have expected a text/WhatsApp to say thanks?
She's in business. I think manners count and this sort of thing could count against her in future.

Imo the correct thank you to the necklace would have been, "Oh it's lovely, I've been wanting one of these, it will go with so many of my outfits, thank you so much". Try necklace on and preen.
When I receive flowers I usually photograph them and send it in Whatsapp with a big thank you and they're gorgeous.
Anything less than this is a bit meh!