If you have TJ and the board is 789TJ then any queen or a QK will beat you.
You’re correct. I meant to type SOFT playing.
You should play that way because that’s how the good Stud players play. Big cards are better than small cards.
If we both make a pair on 4th street you are far behind. If we both hit a straight card on 4th street I have four cards to pair that will all be better than any pair you can make (note that I have a better kicker if we both make a pair of nines or tens.) If we both make our straight, you lose. If we both end with a pair or two pair, you lose. If we both miss everything and don’t improve our hands at all, you lose.
You have to get lucky to win – I don’t; I win when I get lucky AND I win when the luck is even because big cards beat small cards.
It only applies to straights where you use both hole cards to make the straight and the final board could allow for several different straights, also using both hole cards. If a player can use 1 card to make a straight or the board itself forms a straight, the ten jack thing is irrelevant.
I learned this tip many years ago from a book either by Doyle Brunson or Amarillo Slim. I can’t find the original reference after a bit of searching but it is mentioned here.
I was only remembering one part of the uniqueness of the J 10 hand with regard to straights. They are the only two cards that can be part of four different straights and make the highest straight in each case. KQ can only be part of two straights and QJ can only be part of three.
If you have the 2, 4, 6, 8 and 10 of clubs, they call that the Chattanooga Gut Punch and the other players get to punch you in the stomach.
And you still probably win, because you’ve got a flush.
Seriously, even if that is a real houserule somewhere, it has basically no effect on the game, because that specific hand would be incredibly rare, so much so that everyone at the table could go their entire lives without ever seeing it.
Actually, in Texas Hold’em you’d quite likely lose to a better flush. I’d be extremely wary of betting on that hand.
A ten high flush is a strong hand. I wouldn’t want to bet my stack if someone was absolutely slamming the pot or if there were four clubs on the board (and therefore another player needs only one high club to win) but you can’t toss a teenaged flush away too easily.
If you make that flush before the river, especially, you should usually bet to win. Don’t make it a good call for anyone with one club to draw to another.
If poker was simply a game of odds, it would be a good bet. It would lose half the time, but the other half it would win 9x my bet.
In reality, if my opponent is betting with three suited cards in the flop, then I have to consider he’s probably got a flush, and likely higher than my 10. I’d have to be cautious about calling the bet.
I have to admit, I was just kidding and made something up. It would be awesome if it became a thing though 
But it can’t become a thing, because it’s too rare. I’ve seen this multiple times, with people trying to invent poker-like games (for fantasy worlds or such): They come up with a bunch of specific named hands, and there’s a detailed explanation for the history of each hand and why it’s significant, and none of it matters, because nobody ever gets any of those named hands. There’s a reason why the poker hands are all based on obvious patterns.
Perhaps he 'd merely like you to think he has a flush.
Depends on the character of the better and the size of the pot/stake. On the other hand, in Omaha yes, I never count on anything less than a king high flush barring people who definitively bluff.
“There are few things that are so unpardonably neglected in our country as poker. The upper class knows very little about it. Now and then you find ambassadors who have sort of a general knowledge of the game, but the ignorance of the people is fearful. Why, I have known clergymen, good men, kind-hearted, liberal, sincere and all that, who did not know the meaning of a flush. It is enough to make one ashamed of the species.”
- Mark Twain