You have opened your mouth and removed all doubt, you are a fool.
Start your post with an insult, nice way to show your own arrogance.
Virtually all crop plants, GMO or not, are highly resistant to pesticides. Pesticides kill bugs, usually insects, not plants.
Wrong. The main GM plant that people moan about is GM Soya made by Monsanto. They created GM soya as normal soya was killed if you used roundup weed killer on it. So Monsanto create a GM crop to increase their weedkiller sales.
Ok, you could argue that there is a difference between a pesticide and a weed killer but that is just being pedantic. The truth is the parent poster kind of had a point, they just screwed up by saying "Pesticide" when they should have said "WeedKiller". Interestingly wikipedia has the following to say about pesticides:
"A pesticide is generally a chemical or biological agent (such as a virus, bacterium, antimicrobial or disinfectant) that through its effect deters, incapacitates, kills or otherwise discourages pests. Target pests can include insects, plant pathogens, weeds, mollusks, birds, mammals, fish, nematodes (roundworms), and microbes that destroy property, cause nuisance, spread disease or are vectors for disease. Although there are benefits to the use of pesticides, some also have drawbacks, such as potential toxicity to humans and other animals. According to the Stockholm Convention on Persistent Organic Pollutants, 9 of the 12 most dangerous and persistent organic chemicals are pesticides."
So many people seem to consider it fair enough to call something a "pesticide" when the actual pest being killed is a weed. I know the correct term would be herbicide but hey, who am I to argue with wikipedia :)
You might want to read the following, paying particular attention to the section on Glyphosphate resistant crops: https://en.wikipedia.org/wiki/Genetically_modified_crops
Your concern about 'buying seeds every year' is extremely misguided and mostly wrong. Most farmers buy seed each year anyway, GMO or not.
That is also arguable. That might be the norm in the intensive farming in the developed world but it is not the case everywhere.
I think he was referring to the spate of farmers suicides in India where using seeds from a previous harvest is more common: http://en.wikipedia.org/wiki/Farmers'_suicides_in_India. This was actually blamed on them not knowing they were buying seeds where the crops would produce sterile seeds so that a year after the bought the crop they planted a load of duds that did not grow.
I am not entirely sure why a bunch of farmers started killing themselves in far away country, but keeping some of your seeds from a previous harvest is still common in the case of third world subsistence farming it seems.
Personally I am not sure I agree with all of the anti GM lobby or not, but you were an insulting twat when it was not warranted as some of what he was saying actually had a basis in fact. You could have more politely corrected him without calling him a fool, especially since your post was very light on factual content and evidence itself. I am being deliberately insulting to let you know how it feels, but have tried to include more references to some of my assertions.