Start with shallow compliments that could be used for anyone. "He always had a smile on his face" or "She was always kind to everyone" are nice ways to devalue any actual depth the person had in life while also vaguely insinuating that your enemy may have been blissfully retarded. In truth, anyone who spent an entire life smiling and blindly throwing around kindness would be a nightmare to hang out with; all that optimism would get exhausting. But the bereaved love hearing this kind of thing, and it has the added benefit of replacing the real memory with a flimsy, two-dimensional caricature. Already you are chiseling away at the true personality of your rival.
Once you've thoroughly stripped away his or her individuality with trite cliches, take a moment to remind your audience of the very specific shortcomings of your enemy ...
Accuse the Deceased of Leaving Early!
A throaty and broken assertion that your enemy was taken too early from this world is a surefire way to let everyone know that he left a lot of loose ends before (cowardly) dying. Responsible people finish what they start. By saying, "He was taken before his time," you can indirectly acknowledge that your enemy left a lot of shit unaccomplished.
Some unfinished projects will be more tangible than others.
It doesn't matter where you focus, be it the moments you wished you'd spent together, the things you never got to do or even the goodbye you'll never get to say; these all translate to failures that the person in the casket can only silently shoulder. You, after all, are still making the effort, while your adversary has cut ties and left. Best of all, as you rattle them off one by one, everyone in the crowd will tearfully nod and think about the personalized and private ways he also let them down. It's going to be great.
Now, if you accidentally smile, don't worry. You have an out ...
Share an Intimate Story That Highlights Your Disappointment in the Deceased!
This is a good time to bring up embarrassing anecdotes that pivot on the endless inadequacies of your enemy. Be careful, though; this should have a very specific order and flow to it or else it will come off as a charming memory, which is the last thing you want. Here's how it should play:
"[Name of the intolerable corpse] always dreamed of getting a pilot's license/writing a book/seeing Vietnam/etc., but life just got in the way, as it will do. (Look pensively toward the horizon as though you're writing a mental note to make time for more awesome things before you die.) Jobs, family, friends -- these are the things that came first for [name of the unpleasant carcass]. She never got to live out those dreams, because we -- you and I -- were always the priority." (Point skyward with both index fingers and address the ceiling.) "Well, now you've got your wings, champ/I'm sure you've got some crazy stories to tell now, buddy/I'm sure you're seeing the world with a whole new perspective, you paltry bitch/etc."
"I decided to self-publish up here. It's just easier, and I get to keep creative control. Anyway, I've got a box of these if you want one."
The grievers will appreciate the sentiment, but you all know that the through-line of the story is your enemy's incompetence and how she's missing the biggest deadline of all. Furthermore, pointing to heaven is a nice gesture, even if everyone knows that dead is dead. They will still respect you for pretending.
By now you're probably feeling pretty good, so the next step is to subtly establish the possibility of an after party.