Eh. I draw the line in a slightly different place. I think saying that some piece of software is bad is not an attack on the developers. It doesn't imply ill will, or entitlement or any of that. People are allowed to write whatever software they want. And its generally net positive to share that software, for free, with the world.

These things are true at once:

- Good work inkscape developers! Inkscape is used by lots of people. I'm happy for the developers and the users, and I hope inkscape keeps getting better.

- I don't want to use inkscape because when I tried it, it seemed ugly, slow and buggy.

The only problem here is when people equate "this program is junk" with "this person is junk". That's a very dangerous belief to have, because it makes an enemy out of practice. And an enemy out of experimentation. The road to expertise is paved by mistakes. If bad quality work makes you a bad person, you can never learn a new skill.