Either way, the lecturer is offering you his personal time outside of the lecture to give you personal attention to address your problem. This is something you should be glad for, not upset by. Many lecturers will not give you this opportunity.
You're doing just that actually. They're not half there and half not, they simply won't waste their time on you. You're one in hundreds. You need to show these lecturers that you're worth their time. Do the extra work, look it up. Then tell them which avenues of reserach you've exhausted and which aspects you don't understand. Once you come at them with that they will more than likely help you. Lecturers are not obligated to spoonfeed you. This isn't high school. If you're looking to be spoonfed you don't belong in tertiary education.
I was once told by a lecturer when I asked a question about second year to not worry about it because I would never make it to second year anyway. I didn't whine about it. Instead I worked my arse off and I made it to second year with marks right up at the top of my class. Once that happened his whole attitude changed. Remember they're on the lookout for kids that show potential to come join their post graduate units.
In short: Man the fsck up.
and some genuinely recommend decent journal articles to read that cover the topic beautifully, or chapters from other textbooks, freely available in the library, that will give you a greater understanding than you get out of the lectures. I've met lecturers like that often. You have a very unhealthy view on lectures. If you want that first class pass you have to work for it and that includes attending your lectures.