My cousin recently had a big milestone birthday so I decided to send her something a bit special.. an item of jewelry that I knew she liked. Sent it recorded mail so could track that it arrived safely. It did, but I only knew that from royal mail website. She didn't even bother to contact me, not even a quick text. I waited nearly 2 weeks, just in case she was ill or some crisis stopped her. I texted to ask if it had arrived (didn't say I already knew it had!). Then she just replied with words like "oh yeah, got it thanks.."
Aibu to think this is rude? Wouldn't have said thank you unless I chased?