I see a blue flag often...
I'm not that fast. I try to be consistant, and predicatble.
However, most blue flag problems come from the Leaders, and not the ones being lapped. Most of the blue flags are for lead lap cars about to go a lap down. I know of NO racing series that says you cant fight to stay on the lead lap. If you want to put me a lap down, you're going to race me for it. Now, most of the time, I will get out of the way because the leaders ar faster than me, but I've been wrecked by the leaders before when the leade was running laps barely 0.01-0.02 seconds faster (early wreck/t1 mess puts me back there) If your not noticably faster than me, and Im still on the lead lap, im not pulling over. If its obvious that you are faster than me, I will let you go
The other problem is that 9/10 times, the leader thinks that blue flag means "get out of my way NOW". Multiple times I've been wrecked in fast/tight chicanes by idiots that dont understand the concept of safe passing zones. If I slow down there, you will have to slow down too...if you try to pass me, we will wreck. Hold your damned horses and engage your brain.
Lastly, like the OP... if you spam me with a blue flag mesage, I will make damned sure to slow you down. I have the message on my screen, I dont need the secondary BS from you...its cocky and annoying, and it doesnt make you cool.
Also, 3 times now I've given the inside line of a corner to the leader, only to be wrecked. I'm giving you the prefered line, if you cant take the corner without sliding out into me, its YOUR fault, not mine. If Im outside of you, you might not be able to go all the way out to the rumble strips on exit... Im certainly not going to brake coming out of a corner into a long straight...and cost myself 8-10mph down the whole distance of the straight...
The last one...when I give you room...and you cut me off immediatly...i will not hit my brakes. I've seen a couple of these 3rd person, and been involved in one. When you pass me, make sure you're cleared before you get into my line. At first I would slow for people, but it gets so damned annoying that I've stopped now. I've wrecked one person for it, and almost wrecked a few others. Its the responsibility of the passer to make sure they have cleared the car they passed, not the other way around.
In the end, its respect. Treat me with respect, you get it back. Act like a clown, you'll get that back too. People seem to forget that the race for 1st through 3rd isnt the only race on the track. Givin the amount of t1 wrecks (by the way, LFS is better in this category than most games i've played...much less t1 wrecks) you often break the field up into 2 or 3 groups. If im racing someone hard for 10th, im not slowing down for the leader for the sake of slowing down...I've got my own race to run.
To the core of the original topic, spamming is rude. Its also illogical. If the person doesnt obey the BIG BLUE TEXT in the middle of their screen, they arent going to obey yours. If they see the BIG BLUE TEXT and obey it, you're is absolutely useless. In other words, it servers absolutely no point at all. It has 0 net impact on the outcome.