he was watching me eat, grabbing out and could sit up
I do hate that.
I would guess that most 6 month old babies would enjoy watching Mum use a hammer and would try to grab hold of it if hammer was offered in their direction. This does not mean baby is 'ready' to use a hammer!
Just because they watch parents eating and grab at food does not automatically think babies are ready to eat solids.
My personal belief is that many issues surrounding weaning come from babies who are weaned too early and too quickly. As Red says above, that might be 10 months old, just as it might be 7 months or indeed 11 months.
It's not until baby is 1 that you reach the expectation that baby should be eating a full diet including three meals.
Yes, do start offering food to baby at 6 months old. But there is no need to worry about how much is eaten. Milk provides the calories and so milk feeds needs to be maintained at least at the same level as before weaning, often babies need more milk past 6 months old, not less.
Baby will naturally start eating more food and drinking less milk as they get the hang of it. Parents don't really need to do anything to encourage this to happen, just keep offering a variety of textures and tastes in the form of 'meals' and in time baby will make the changes him/her self.
At 6 months old my youngest was having 7 or 8 full milk feeds per day, plus three 'meals'. Fitting in all these feeds meant it was back to the newborn days of spending all of baby's awake time feeding her.
I say if you are worried about baby loosing weight (and you don't necessarily need to worry) then increase milk feeds if baby is showing you he isn't ready for more solids yet.
not get too upset when he refuses my lovingly prepared food
Get used to that. Eleven years of parenting and four children, and it still stings when the kids screw their noses up at a meal I have spent the last hour making.