Left wingers do this too. Except instead of "THEY'RE EATING THE CATS AND DOGS" it looks like:

"No one else will ever accept you."

"You're too oppressed to be understood by anyone but us."

or

"Anyone outside our group is dangerous."

Check in with yourself about how online communities make you feel.

Do they make you feel hopeful, or hopeless? Connected, or isolated? Accepted, or tolerated?

Do they encourage you to think for yourself, and use critical thought? Or do they ask you to accept without thinking and toe the line? Is there open communication, or are differing opinions bullied into silence?

Beware of anyone who tries to isolate you.

Beware of anyone who tells you no one else will ever love you like they will, that no one else will ever accept you.

Beware of anyone that tells you life is nothing but pain, or that there is no hope.

Hopeless, lonely people are easily controlled.

I know things are scary right now. I'm scared too.

Look out for people who WANT you scared.

Try to find spaces that make you feel like change is possible. Look for people who make you feel empowered to do something!

The long answer is that Bisexual used to mean exactly what we use Pansexual for now, but the language we use for various genders and our understanding of attraction and non-binary identities has expanded beyond what the “bi” implies, and so for a lot of people the choice in label is highly dependant on individual experience, subjective reality, and personal opinion, on top of which the waters are muddied by bad-faith takes, attempts at progressive development, and pointless infighting spurred on by transphobic rhetoric that ultimately contributes nothing of value to the community.

The shorter answer is “whatever the bi or pan person speaking to you says it is for them”, and the shortest answer is “the flags are different”