Does the other site have the same stick up their arse about this site?
Of course not. In fact, many people from this site decided to set up accounts on ours to "spam" links as well. One notable example would be SCG. We think there's nothing wrong in linking to other websites as long as it fits within the substance of a discussion. A quick search for references to theflatearthsociety.org on our forum yields some 10 pages of results (half of them about how the site is down and/or hacked)
I seem to remember Parisifal or Pizza or someone admitting this was indeed the case last time we brought this up.
I suspect you're referring to the time you lambasted me over my sig (which was only "spammed" underneath my posts on a technicality), which was officially the reason for the "google" filter in the first place. I admitted that I had agreed to remove it out of good will (not that it was against the rules - it was not), and that I didn't do it afterwards, because I forgot - this was around the time when I worked 12-hour days, and admittedly things went under my radar here and there.
I pointed out that you could have simply poked me and reminded me to do it, but by that point you were too busy decrying us terrorists.
Certainly you at least remember the avatar spam campaign.
Sure, that's a thing that happened (whether or not it was "spam" will be a topic of some contention, but at least we can agree we're referring to an event that actually happened). Those involved have largely admitted their mistake and cleaned up. I also offered to help you clean up any instances of text links that you believed were unjustified, but, again, instead of taking me up on the offer, you just threw insults around.
Most importantly, however, you're missing the pertinent point here. Your filter does not affect us in any way. We're growing at a steady pace, through our own efforts. Whether or not you litter your website with broken links is your prerogative, and we generally only stop by when you try to lie about us (which I guess is fairly frequent). The main party affected is your users, and it's your users who tend to bring this matter to S&C these days. If you're going to make your userbase's life (very, very slightly) harder because you hold a grudge against a handful of avatars from four years ago, it only reflects on you.