I sent someone a message who normally has read receipt turned on so blue ticks turn blue.. I sent 2 messages that had 2 grey ticks and I could see he was online. Not proud of myself but I sent a shitty message and implied he was ignoring me. It had been 2 hours and he doesn't like it when I go quite. He replied saying how dare you, I haven't had any messages. The shitty one I sent had 2 blue ticks.. my question is could he be mucking around with settings or could it show as received but he didn't get it. He took a screenshot to "prove" I hadn't sent any but it also had the nasty one he sent removed too