This has happened to me a few times, especially when I'm on my fursona and with my best friend who's also on her own fursona. It gets frustrating sometimes because I'm mainly on a lion and I'm usually never on anything else, there's only a fair few lion RP's you can find which suit your own standards. For starters, my standards are: Literate, realistic to accept a grey lion (if with my friend a white lion too), mapless/mapped and active. I get about up to four requests a day from lion pride's, I'm flattered people want you to join their group but sometimes it has to be a no.
People need to understand their thirst in getting members may tick people off, I'd rather be whispered and asked then get sent an invite!